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Reports <code>@GuardedBy</code> annotations in which the guarding field
is not <code>final</code>.
<p>Guarding on a non-final field may result in unexpected race conditions, as locks will
  be held on the value of the field (which may change), rather than the field itself.</p>
<p>Example:</p>
<pre><code>
    private ReadWriteLock lock = new ReentrantReadWriteLock(); //not final guarding field
    private Object state;

    @GuardedBy("lock")
    public void bar() {
        state = new Object();
    }
</code></pre>
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<p>Supported <code>@GuardedBy</code> annotations are:</p>
<ul>
  <li><code>net.jcip.annotations.GuardedBy</code></li>
  <li><code>javax.annotation.concurrent.GuardedBy</code></li>
  <li><code>org.apache.http.annotation.GuardedBy</code></li>
  <li><code>com.android.annotations.concurrency.GuardedBy</code></li>
  <li><code>androidx.annotation.GuardedBy</code></li>
  <li><code>com.google.errorprone.annotations.concurrent.GuardedBy</code></li>
</ul>
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